Figure 9.

Main results of the UPLC-ESI-Q-TOF-MS/MS analysis of licochalcone A: (A) total ion chromatographic diagram of licochalcone A; (B) primary MS spectrum of licochalcone A; (C) MS/MS spectrum of licochalcone A; (D) total ion chromatographic diagram of the licochalcone A–DPPH adduct extracted by [C₃₉H₃₃N₅O₁₀-H]⁻; (E) primary MS spectrum of the licochalcone A–DPPH adduct; (F) MS/MS spectrum of the licochalcone A–DPPH adduct from peak 2 in (D); (G) total ion chromatographic diagram of the possible dimeric products of licochalcone A extracted by [C₄₂H₄₂O₈-H]⁻; (H) primary MS spectrum of the licochalcone A–licochalcone A dimer; and (I) MS/MS spectrum of the licochalcone A–licochalcone A dimer from peak 1.